docstr: make sure note2freq('A3') == 220
docstr_tok: ["make","sure","note2freq","(","'A3","'",")","==","220"]
code: def test_note2freq(self):
      "make sure note2freq('A3') == 220"
      self.assertEqual(220, note2freq("A3"))
  
imports: from __future__ import unicode_literals
  from aubio import note2midi, freq2note, note2freq, float_type
  from numpy.testing import TestCase
  from _tools import parametrize, assert_raises, skipTest
label_desc: Use image node_id 1 for calling the note2freq_simple_test obj's underlying member method code with example usage: obj.test_note2freq() without return types